Plantronics Blackwire C620 Binaural Headset. Work smarter and make your world sound better with this advanced audio headset. The Blackwire 620M is perfect for business or pleasure. Optimized for Microsoft Office Communicator 2007 and Microsoft Lync 2010, it is the ideal headset for constant communicators. Unmatched clarity and dynamic EQ stereo for voice and multimedia. Wideband support for best quality PC calls Noise-canceling microphone squashes background noise Enhanced Digital Signal Processing (DSP) for natural voice sound SoundGuard technology protects against audio spikes Adjustable headband and soft ear cushions Convenient controls for call answer/end, mute, volume /- Size: 9" x 5.75" x 4.25"